A while ago he shared his post processing technique with the DPreview forum readers.
First of all, you need to convert your PEF or DNG without any sharpening and export it to Photoshop (or save as TIFF or PSD to load it to Photoshop later). If you shoot in JPEG directly, use Neutral settings, but shooting RAW will give you much better results. Load your PSD or TIFF into Photoshop and apply Unsharp Mask (USM) filter with the following settings:
Amount: from 240 to 330 percent
Radius: 0.3 pixels
Threshold: 0 level
After that repeat Unsharp Mask with the Amount from 10 to 15 percent and Radius from 40 to 60 pixels (Threshold still at 0 level) .
Then you should duplicate layer and decide for yourself whether you want to emphasize blacks or colors and shadows. In first case you need to desaturate new layer, in the second – leave it as is.
Go to the Layers window and apply Soft Light blending mode to the duplicated layer. Then reduce it’s opacity to 50 – 80 percent at your taste. That’s all, flatten image “and ‘Voila’ a medium format film look in digital”.